#pragma once
#include <string>
#include <iostream>
#include <stdarg.h>
#include <ctime>
#include <cstdio>

//日志是有日志级别的
#define DEBUG   0
#define NORMAL  1
#define WARNING 2
#define ERROR   3
#define FATAL   4


const char* gLevelMap[] = {
    "DEBUG",
    "NORMAL",
    "WARNING",
    "ERROR",
    "FATAL"
};

#define LOGFILE "./calculator.log"

//完整的日志功能，至少包括：日志等级 时间 支持用户自定义(日志内容, 文件行, 文件名)
void logMessage(int level, const char* format, ...)
{
#ifndef DEBUG_SHOW
    if (level == DEBUG)
    {
        return;
    }
#endif
    // va_list ap;
    // va_start(ap, format);
    // while ()
    // int x = va_arg(ap, int);
    // va_end(ap);//ap = nullptr

    char stdBuffer[1024];//标准部分
    time_t timestamp = time(nullptr);

    snprintf(stdBuffer, sizeof stdBuffer, " [%s] [%ld] ", gLevelMap[level], timestamp);

    char logBuffer[1024];//自定义部分

    va_list args;
    va_start(args, format);
    //vprintf(format, args);
    vsnprintf(logBuffer, sizeof logBuffer, format, args);

    va_end(args);

    FILE* fp = fopen(LOGFILE, "a");

    // printf("%s %s\n", stdBuffer, logBuffer);
    fprintf(fp, "%s %s\n", stdBuffer, logBuffer);

    fclose(fp);
}